/* roulang page: index */
:root {
      --color-primary: #3D5A3C;
      --color-secondary: #E8D5B7;
      --color-accent: #E85D3A;
      --color-bg: #FBF7F2;
      --color-dark: #1E2F1E;
      --color-text: #1E1E1E;
      --color-text-light: #5C5C5C;
      --color-border: #D0D9CD;
      --color-white: #FFFFFF;
      --color-card-bg: #FFFFFF;
      --color-light-bg: #F0F4EF;
      --color-testimonial-bg: #F7F1E8;
      --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-data: 'DIN Alternate', 'Bebas Neue', sans-serif;
      --shadow-card: 0px 4px 16px rgba(0,0,0,0.04);
      --shadow-card-hover: 0px 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition: all 0.2s ease;
      --max-width: 1280px;
      --nav-width: 220px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.8;
      display: flex;
      min-height: 100vh;
      flex-direction: row;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      transition: var(--transition);
      border: none;
      outline: none;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      line-height: 1.3;
    }
    h1 { font-size: 2.5rem; letter-spacing: 0.02em; }
    h2 { font-size: 2.2rem; }
    h3 { font-size: 1.5rem; }
    h4 { font-size: 1.25rem; font-family: var(--font-sans); font-weight: 600; }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 40px;
    }
    /* 桌面端左侧竖向导航 */
    .desktop-nav {
      width: var(--nav-width);
      background-color: var(--color-primary);
      color: white;
      display: flex;
      flex-direction: column;
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      z-index: 1000;
      box-shadow: 2px 0 15px rgba(0,0,0,0.08);
      padding: 24px 0;
    }
    .logo-area {
      padding: 20px 28px 40px;
      display: flex;
      align-items: center;
      gap: 12px;
      border-bottom: 1px solid rgba(255,255,255,0.2);
      margin-bottom: 32px;
    }
    .logo-icon {
      font-size: 32px;
      color: var(--color-accent);
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
    }
    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: 2px;
      color: white;
    }
    .nav-links {
      list-style: none;
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 8px;
      padding: 0 16px;
    }
    .nav-links li a {
      display: block;
      padding: 12px 20px;
      border-radius: 8px;
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      position: relative;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      background-color: rgba(255,255,255,0.12);
      color: white;
    }
    .nav-links li a.active::before {
      content: '';
      position: absolute;
      left: 0;
      top: 10px;
      bottom: 10px;
      width: 4px;
      background-color: var(--color-accent);
      border-radius: 0 4px 4px 0;
    }
    /* 主内容区域 */
    .main-content {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
      background-color: var(--color-bg);
      overflow-x: hidden;
    }
    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: var(--color-primary);
      color: white;
      z-index: 1100;
      padding: 16px 20px;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 2px 12px rgba(0,0,0,0.1);
    }
    .hamburger {
      font-size: 28px;
      background: none;
      border: none;
      color: white;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background-color: var(--color-dark);
      flex-direction: column;
      padding: 24px;
      z-index: 1050;
      gap: 8px;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      color: white;
      padding: 14px 20px;
      font-weight: 500;
      border-radius: 8px;
    }
    .mobile-menu a:hover {
      background: rgba(255,255,255,0.15);
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    .hero-section {
      padding-top: 120px;
      padding-bottom: 100px;
      background: linear-gradient(135deg, rgba(61,90,60,0.08) 0%, rgba(232,213,183,0.15) 100%);
    }
    /* 卡片与组件 */
    .card {
      background: var(--color-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 32px;
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }
    .btn-primary {
      background: var(--color-accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 10px rgba(232,93,58,0.3);
    }
    .btn-primary:hover {
      background: #C94A2E;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(232,93,58,0.4);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--color-primary);
      color: var(--color-primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: var(--color-primary);
      color: white;
    }
    .btn-link {
      color: var(--color-primary);
      font-weight: 600;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    .btn-link:hover {
      color: var(--color-accent);
      text-decoration: none;
    }
    .grid-2, .grid-3, .grid-4 {
      display: grid;
      gap: 24px;
    }
    .grid-2 { grid-template-columns: repeat(2,1fr); }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-4 { grid-template-columns: repeat(4,1fr); }
    .text-accent { color: var(--color-accent); }
    .bg-dark { background-color: var(--color-dark); color: white; }
    .bg-light { background-color: var(--color-light-bg); }
    .divider { height: 1px; background: var(--color-border); margin: 32px 0; }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--color-border);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--color-text-light);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .desktop-nav { display: none; }
      .main-content { margin-left: 0; width: 100%; }
      .mobile-nav { display: flex; }
      .container { padding: 0 24px; }
      .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.8rem; }
      section { padding: 70px 0; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }